body{margin:0;background:#111;color:#fff;font-family:Arial}header{text-align:center;padding:60px;background:#000}h1{color:#f58220;font-size:3rem}.btn{display:inline-block;background:#f58220;color:#fff;padding:12px 20px;text-decoration:none;border-radius:6px}section{max-width:900px;margin:30px auto;background:#1f1f1f;padding:20px;border-radius:8px}